John f



(No Model.)

J. RALLBN.

RATGHET BRAGE.

No. 320,323. Patented Juri@ 16, 1335.

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@atrae rarns JOHN F. ALLEN, OF NEV YORK, N. Y.

RAToHl-:T-BRAACE.

SIECIFICATION forming part of Letters Patent No. 320,323,6iated June 1G, 1885.

Application tiled March 18, 1885.

To all whom it may concern,.-

Be it known that I, JOHN F. ALLEN, a citizen of the United States, residing in New York, in the State of New York, have invented a new and useful Improvement in Ratchet- Braces, of which the following is a specification.

The nature of my invention consists in the arrangement of gearing connecting the spindle or stock with the adj usting-screw for the purpose of producing an automatic and regular feeding device during the operation of the drill.

In the accompanying drawings Figure I represents a section of ratchet-brace embodying my invention. Fig. Il is a cross-section at line 2 2, Fig. I. Fig. III is a cross-section at line3 3, Fig. I; and Fig. IV is a section and internal view of the gear-wheel.

Similar letters represent similar parts in all iigures.

A represents the spindle or stock, into the lower part of which the tool Bis inserted and in the upper part the adjusting-screw G. This spindle is provided with a ratchet, D, around which the handle E is fitted, arranged with a suitable spring-pawloperating the ratchet in the usual manner. Around the upper part of this spindle A a sleeve, F, is placed, attached to the handle E and turning freely with said handle. The upper part of this sleeve forms a hollow chamber, F, the internal diameter of which is eccentric with the end of the spindle. The upper end of the spindle has teeth a cut in its body, forming a pinion, as shown in Figs. I and III. Instead of cutting the teeth into the spindle,a suitable pinion may be attached; but I prefer cutting the teeth into the spindle, so as to allow the sleeve to pass freely over the same without the necessity of disconnecting any part, as would be required if a pinion is attached.

G is a ring fitted loosely into the chamber F', capable of turning freely. The lower internal part of this ring is provided with teeth m, corresponding with the teeth a at the end of the spindle and meshing into the same. The number of teeth in this ring G must be more than the number of teeth on the end of the spindle. For braces to be used on (No model.)

wrought-iron one tooth more in the ring G will be about the right proportion, while for braces to be used for cast-iron two teeth more in the ring G than at the end of the spindle will be required. The upper part of the ring G is made with a recess, w, (see Fig. IV,) for the purpose hereinafter mentioned.

Upon the top of the spindle A a ring, H, is placed, passing freely aroundthe adjustingscrew C. This ring I-I has at its lower part a tongue or projection, lv, fitting into the recess w in the ring G. This ring II is provided with a key, K, fitting into a suitable groove in said ring and working in a groove, L, extending the whole length of the adjusting-screw O. By this arrangement the motion given to the ring G is communicated to the ring H, and through the key K to the adjusting-screw C. The key K is fastened in its position by a small pin, J.

The operation is as follows: By detaching the key K and withdrawing thc same out of the ring H and from the groove L in the adjusting-screw O, this screw C can be turned in the usual manner to regulate the length of the ratchet-brace and iit the same to the work. The key K is then, replaced and secured by the pin J, when the brace will be ready for operation. By the forward turning of the spindle A and tool the teeth a in the top of the spindle will turn the ring G. The difference of speed between the spindle A and this ring G depends upon the relative proportion of the teeth in the spindle A and said ring G. This motion of the ring AG is communicated to the ring H through the connection of the two by means of the tongue v on the ring H with recess w in the ring G, and through the key K, connecting this said ring H with the adjusting-screw O. Said screw C is turned in the Spindle A, producing thereby the desired regular feeding of the tool automatically during its operation. The amount of this feed depends upon the pitch of the screw-thread on the adjusting-screw C, and upon the relative number of teeth in the ring G, and on the end of the spindle A.

The ring G and ring II are retained in their proper position by the cap-plate N, fastened to the top of the chamber F.

ICO

3. In a ratchet-brace, the combination of toothed spindle A, the rings G and H, connected by tongue or projection o, the key K, 15 and the adjusting-screw C, having groove L, arranged to operate in the manner and for the purpose substantially as specified.

JOHN F. ALLEN. Witnesses:

HENRY E. ROEDER, RoBr. ROY, 

